Data loss occurs when using tez engine to join different bucketing_version tables

Test case：
create table table_a (a int, b string,c string);
create table table_b (a int, b string,c string);
insert into table_a values (11,'a','aa'),(22,'b','bb'),(33,'c','cc'),(44,'d','dd'),(5,'e','ee'),(6,'f','ff'),(7,'g','gg');
insert into table_b values (11,'a','aa'),(22,'b','bb'),(33,'c','cc'),(44,'d','dd'),(5,'e','ee'),(6,'f','ff'),(7,'g','gg');
alter table table_a set tblproperties ("bucketing_version"='1');
alter table table_b set tblproperties ("bucketing_version"='2');
Hivesql：
set hive.auto.convert.join=false;
set mapred.reduce.tasks=2;
select ta.a as a_a, tb.b as b_b from table_a ta join table_b tb on(ta.a=tb.a);

set hive.execution.engine=mr;
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set hive.execution.engine=tez;
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